I want to take a small group of 13 year olds paintballing. About 7 in the group? I will go by public transport with some (or all) of the boys, though some will have a car and may prefer to meet directly there. I live in Kennington (SE London) and the others live anywhere between here and Dulwich. Can anyone recommend one? Priority has to be accessibility, but of course price and fun are also a factor. I don't mind travelling to other parts of London if they offer a pick up service from an easy-to-get-to station. Any suggestions?